Harmsco (HB-20-20W) 20"X4.5" Big Blue "Calypso Blue" Pleated Sediment 20 Micron Filter Total Dissolved Solids (TDS)2871 Periodic backwashing at 8–12 gpm

Periodic backwashing at 8–12 gpm per square foot prevents packing and reclassifies the bed

💧 Nitrate contamination is colorless

5" FNPT inlet and outlet lines with Teflon tape or thread sealant

Verify your pump model before ordering to ensure proper fit with existing pump components and tubing assemblies

Granular activated carbon

Harmsco (HB-20-20W) 20"X4.5" Big Blue "Calypso Blue" Pleated Sediment 20 Micron Filter Total Dissolved Solids (TDS)2871 Periodic backwashing at 8–12 gpmThe Harmsco HB 20 20W delivers reliable 20 micron sediment filtration in a durable pleated polyester design built for both whole house and reverse osmosis applications. This 20"x4. 5" Big Blue cartridge fits standard Harmsco housings and offers exceptional dirt holding capacity with the extended surface area of pleated media. SPECIFICATIONS Harmsco HB 20 20W Technical Details Model Number HB 20 20W Dimensions 20" x 4. 5" (Big Blue Standard) Micron